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chromium/third_party/blink/web_tests/external/wpt/css/css-flexbox/dynamic-stretch-change.html 

<!DOCTYPE html>
<link rel="help" href="https://drafts.csswg.org/css-flexbox-1/">
<link rel="match" href="../reference/ref-filled-green-100px-square-only.html">
<p>Test passes if there is a filled green square.</p>
<div id="target" style="display: flex; width: 100px; height: 200px;">
  <div style="display: flex; flex-grow: 1; min-height: 100px;">
    <div style="background: green; flex: 1;"></div>
  </div>
</div>
<script>
document.body.offsetTop;
document.getElementById('target').style.alignItems = 'start';
</script>